I run a Debian 6.0.6 homeserver at my place which is connected via DSL to the internet. It has a dynamic IP.

Hostname: homeserverDomain: myexampledomain.eu

I setup iRedMail which runs fine so far: I can send and receive emails from my postmaster@myexampledomain.eu email account.

The problem: Not all of my sent emails reach their addressees! Email provider like GMX.de or WEB.de decline receiving my emails which seems to be a general problem with dynamic IP addresses although the MX lookup for my domain points correctly to myexampledomain.eu (N.B. Other providers accept my emails without objections!)